a.aki-btn {
    text-decoration: none;
    line-height: 1;
    display: inline-block;
    padding: 20px 40px;
    font-size: 16px;
    color: #03e9f4;
    background: transparent;
    position: relative;
    overflow: hidden;
    transition: 0.5s;
}

a.aki-btn:hover {
    background: #03e9f4;
    color: black;
    box-shadow: 0 0 5px #03e9f4,
        0 0 25px #03e9f4,
        0 0 50px #03e9f4,
        0 0 200px #03e9f4;
    -webkit-box-reflect: below 1px linear-gradient(transparent, #0005);
}

a.aki-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    animation: animate1 1s linear infinite;
    background: linear-gradient(90deg, transparent, #03e9f4);
}

@keyframes animate1 {
    0% {
        left: -100%;
    }

    50%,
    100% {
        left: 100%;
    }
}

a.aki-btn::after {
    content: '';
    position: absolute;
    top: -100%;
    right: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, transparent, #03e9f4);
    animation: animate2 1s linear infinite;
    animation-delay: 0.25s;
}

@keyframes animate2 {
    0% {
        top: -100%;
    }

    50%,
    100% {
        top: 100%;
    }
}

a.aki-btn>span::before {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(270deg, transparent, #03e9f4);
    animation: animate3 1s linear infinite;
    animation-delay: 0.55s;
}

@keyframes animate3 {
    0% {
        right: -100%;
    }

    50%,
    100% {
        right: 100%;
    }
}

a.aki-btn>span::after {
    content: '';
    position: absolute;
    bottom: -100%;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(360deg, transparent, #03e9f4);
    animation: animate4 1s linear infinite;
    animation-delay: 0.75s;
}

@keyframes animate4 {
    0% {
        bottom: -100%;
    }

    50%,
    100% {
        bottom: 100%;
    }
}